| Birkenhead to Oswego (Illinois) | 3,816.68 mi (6,142.35 km) |
| Birkenhead to Oswego (New York) | 3,284.40 mi (5,285.73 km) |
| Birkenhead to Otsego (Minnesota) | 3,837.51 mi (6,175.88 km) |
| Birkenhead to Ottawa (Illinois) | 3,850.61 mi (6,196.96 km) |
| Birkenhead to Ottawa (Kansas) | 4,225.06 mi (6,799.57 km) |
| Birkenhead to Ottumwa (Iowa) | 3,999.89 mi (6,437.20 km) |
| Birkenhead to Overland (Missouri) | 4,038.00 mi (6,498.53 km) |
| Birkenhead to Overland Park (Kansas) | 4,189.34 mi (6,742.09 km) |
| Birkenhead to Overlea (Maryland) | 3,468.78 mi (5,582.46 km) |
| Birkenhead to Oviedo (Florida) | 4,181.04 mi (6,728.73 km) |
| Birkenhead to Owasso (Oklahoma) | 4,364.05 mi (7,023.26 km) |
| Birkenhead to Owatonna (Minnesota) | 3,880.03 mi (6,244.30 km) |
| Birkenhead to Owensboro (Kentucky) | 3,960.30 mi (6,373.49 km) |
| Birkenhead to Owings Mills (Maryland) | 3,477.47 mi (5,596.45 km) |
| Birkenhead to Owosso (Michigan) | 3,599.01 mi (5,792.04 km) |
